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[Chemical Knowledge]：What are the upstream raw materials for petroleum naphthalene? What do the downstream products contain?

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Petroleum naphthalene is an important product in the field of chemical production raw materials, which is widely used in many fields. Its upstream and downstream related products are numerous, and some of the main upstream and downstream products will be described in detail below.

upstream products:

1. crude oil: petroleum naphthalene is mainly refined from crude oil. Crude oil through a series of distillation, cracking and other processing processes, can obtain a variety of hydrocarbons, including petroleum naphthalene.

2. coal tar: coal tar is also an important source of petroleum naphthalene. Coal tar is a product of the coal dry distillation process, which contains a large number of hydrocarbons, including petroleum naphthalene.

downstream products:

1. Phthalic anhydride: Phthalic anhydride is one of the important downstream products of petroleum naphthalene. Phthalic anhydride can be oxidized by petroleum naphthalene and air under the action of catalyst, and is widely used in the production of plasticizer, unsaturated polyester resin and other fields.

2. thiourea: thiourea can be obtained by reacting petroleum naphthalene with hydrogen sulfide. Thiourea is an important organic compound, which is widely used in medicine, pesticide and other fields.

3. Dioctyl phthalate: Dioctyl phthalate is a commonly used plasticizer, which can be prepared by reacting petroleum naphthalene with phthalic anhydride. It is widely used in plastic products to increase its flexibility and plasticity.

4. carbon fiber: petroleum naphthalene can be used as the precursor of carbon fiber. After high temperature cracking and other processes, high-performance carbon fiber materials can be produced, which are widely used in aerospace, automotive and other fields.

In short, petroleum naphthalene is an important product in the field of chemical production raw materials, and its upstream and downstream related products are numerous and widely used in many fields.

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